Ignition circuit radiation suppression structure

Claim 2

An ignition circuit including a spark plug having a pair of lower spaced apart electrodes, a spark plug lead wire connected in series with the spaced apart electrodes of the spark plug, and a wire wound ignition circuit radiation suppressing resistor connected in series with the series connected spark plug lead wire and electrodes of the spark plug and positioned closely adjacent the electrodes of the spark plug, which resistor has an inductance of approximately 350 to 800 microhenries and a resistance of approximately 15 to 30 ohms.

Claim 3

Structure as set forth in claim 1, wherein the spark Plug includes an outer metallic body portion, and an inner ceramic insulator core received within the outer body portion, and the first of the lower electrodes extends through the insulator core, the second of the lower electrodes is secured to the outer body portion in spaced relation to the first lower electrode, and the spark plug further includes an upper electrode secured to the insulator core in spaced relation to the first lower electrode and the wire wound radiation suppression resistor is positioned within the insulator core and connected at opposite ends to the first lower electrode and to the upper electrode.

Claim 4

Structure as set forth in claim 1, wherein an insulating spark plug boot construction is provided between the spark plug lead wire and the spark plug, the wire wound ignition circuit radiation suppression resistor is positioned within the boot construction which further includes terminals provided within the boot construction for connecting one end of the radiation suppression resistor to the end of the spark plug lead wire and connecting the other end of the radiation suppression resistor to the spark plug so that the radiation suppression resistor is connected in series between the spark plug lead wire and spark plug.